Bicycle Mechanics - Can I run new Campy 11 speed on 10 speed chainrings?

So I'm thinking of changing over a well worn shimano 9 speed DA drivetrain to Campy and seriously looking at the current silver 11 speed Athena group. Currently my crankset is a Ritchey Logic with 50-34 TA Syrius chainrings. These are rated 9/10 speed.

Do I need to replace my crankset or at least the chainrings to run 11 speed Campy? FSA makes compact 11 speed rings but I'd rather not have to make that additional investment.

Sam in Cincy

I'd calculate the ratios you really use , and question
whether you have such abundant funds for the huge inflationary
uptick in chains and cassettes that will wear out and cost at $100+ and $200+ a pop..

But, as chains still are 1/2" pitch ..but, the rollers get thinner,
and so the chain ring teeth get thinner to match..

so the 10 speed width will let the 11 speed chain slide over the teeth,
if tight , wear the chainring tooth faces and stretch the inner plates on the pins a bit

The issue isn't the chainrings themselves, but the separation or the gap between them. Chainrings for 10 and 11s are closer together so the narrower chain cannot fall between them and jam. Your crankset may or may not be OK, but it's easy enough for you to check for yourself.

Shift the FB to an in between position and manually lift the chain so it's resting on the top of the inner chainring and resting against the face of the outer. If there's no way it can fall between them it's a pass. However if it can stay up there resting between the tip of the inner and face of the outer it fails and you'll need to pony up some more dough.

You have to test no other way to know. A lot of guys using 11 with after market cranksets. Probably it will work but you have to test it yourself.

The difference is so small, can't imagine there would be a problem. I have an old bike set up with Campy 10 speed, but running a "5 speed" crank from 1985 and it's fine.
Going the other way, wider chain on a narrower crank might not be good.

You can run a 5 speed chianring with a 10 speed chain w/o any problems as long as it clears the teeth all ok, a 5 speed frewheel is diferent because probably a 10 speed chain will get stuck between the cogs. My personal experience is that you can use a 10 speed chain all the way from 10 up to 8 speed w/o issues and mixing chainrings as well.

Just buy the Athena carbon crank - you'll love it!